specularite

specularite

[′spek·yə·lə‚rīt]
(mineralogy)
A black or gray variety of hematite with brilliant metallic luster, occurring in micaceous or foliated masses, or in tabular or disklike crystals. Also known as gray hematite; iron glance; specular iron.
References in periodicals archive ?
The samples for flotation were taken from on-site samples of flotation, which were ground to 95% passing 0.045 mm, and contained 34.90% specularite and hematite, 8.70% magnetite, 0.20% limonite, 39.40% quartz, 11.40% chlorite and hornblende, and 4.90% calcite and dolomite.
Based on physical characteristics, the chemical adsorption principle, and the reductive degradation principle, tourmaline powder, pyrite powder, and specularite powder, here denoted as T, P, and S, respectively, are selected as basic materials to develop new asphalt modifiers, which could reduce the pollutant emission of hot mix asphalt.
Ils se deplacent dans un espace sans bornes ou les divisions cartographiques sont eclatees, ou les frontieres temporelles s'effritent a chaque instant, ou le commencement et la fin se court-circuitent, ou l'apres antecede l'avant, ou les temps archaiques s'entrelacent, dans un jeu de specularite permanent, avec l'ere moderne.
There is no gold at Tsodilo, but massive quantities of both platy quartz vein and granular micaceous specularite were mined there at this time; a series of radiocarbon ages indicates that mining, complete with tunnels and inclined shafts, was intensive during the period c.AD 750-1025 (Robbins et al.
D'autres experiences encore essayaient de faire jouer certains modeles narratifs conventionnels les uns contre les autres, afin d'elargir le champ de la specularite textuelle et ainsi de mettre la litterature elle-meme en proces.
"Les epigraphes de Borges, speculation et specularite".
d'autant plus aisement que la specularite apparait des
Sometimes hematite of small crystal size, called "specularite" by the miners, was found throughout an orebody--however, very few fine examples were collected during the life of the mine (personal communication, Raymond Clements).